Attack of the Squash Vine Borer!

The squash vine borer is a type of moth that commonly attacks vegetable plants like squash, pumpkins and melons. Resembling a wasp, the adult borer has an orange abdomen with black dots. About a week after the borer lays its eggs near a suitable plant, they hatch and then bore into the base of the plant.

The larva will eat through to the center, which then prevents water flow to the rest of the plant. One of the first signs of squash vine borer damage is sudden wilting of the infected plant. You can also check for holes near the bottom of the stem, which is a good indication of borer damage. If a hole is present, there is still a chance the plant can be saved. Slit the stem vertically about a couple inches up and pull the borer out by hand. Keep in mind that there could be several borers to one plant. After removing the borer, add moist soil just above the cut so as to promote root formation.

It’s also a good idea to begin treating for squash vine borer larva if you find the adults. The adults generally fly around during the day hours, distinguishing them from other moths that fly at night. Hyams offers two types of insecticides, Naturalyte (available as a liquid concentrate) and Captain Jacks (available in a spray or dust).